Backpack



FIG. 1 is a perspective view of a backpack showing the new design.

FIG. 2 is a front view thereof.

FIG. 3 is a back view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a top view thereof.

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a back perspective view thereof.

The dotted line showing of the straps and the zipper pull tabs depict portions of the backpack that form no part of the claimed invention. 

CLAIM I claim the ornamental design for a backpack, as shown and described. 